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[ CVE-2026-91980 · Published 15 Sep 2026 ]

Vikunja: Any user can enumerate every team and its members by attaching arbitrary teams to a throwaway project

CVSS 4.3 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

vikunja before 2.6.0 fails to validate team access when attaching teams to projects, allowing authenticated users to enumerate all teams and members. Attackers can attach arbitrary team IDs via the project teams endpoint to retrieve complete team rosters including member names and admin flags for unauthorized teams.

[ Fixes ]Fixes and patches

  • code.vikunja.io/api 2.6.0Fixed version · GitHub Advisories · go package code.vikunja.io/api: upgrade to 2.6.0 or later (affected <= 2.5.0)

[ Packages ]Affected open-source packages

[ References ]References